Bluescreen is almost ALWAYS a hardware issue (or a virus). It tends to point to faulty memory (google memtest86 and run that, it's not perfect but finds memory errors 95% of the time) or a failing HDD (if you're in a laptop I'd check that first). Do a full bad sector scan (rightclick on your main HDD and choose "Properties" -> "Tools" -> "Error checking" and select "scan for and attempt recovery of bad sectors" (you might have to reboot for your main HDD)
See whether you still have warranty for either of those parts and send it in for them to check out if either are having issues. Repairing bad sectors on a HDD will rarely solve the issue (if it's only one on, maybe... more, forget it, the head is damaged), memory issues = replacement (unless you're on Linux, but then I'd still replace it as part of your memory will not be usable).
Most of the time players with issues are having these due to hardware faults (in my experience 5% of all hardware gets returned due to faults) or old / incorrectly installed drivers.
A PC does not crash or bluescreen regularily, it can happen once in a blue moon, if it happens more often there's other causes!